Synthesis of 3,4-dihydroquinazolin-4-one: selenium-catalyzed reductive N-heterocyclization of N-(2-nitrobenzoyl)amides with carbon monoxide
摘要:
A catalytic synthetic method of 3,4-dihydroquinazolin-4-ones has been developed. When N-(2-nitrobenzoyl)amides were treated with carbon monoxide in the presence of a catalytic amount of selenium, reductive N-heterocyclization of N-(2-nitrobenzoyl)amide efficiently proceeded to give the corresponding 3,4-dihydroquinazolin-4-ones in moderate to good yields. (C) 2002 Elsevier Science Ltd. All rights reserved.
By employing a MOF-templated method, we have developed a highly dipersed and ultralow loading cobalt nanocatalyst, which has been applied in the oxidative functionalization of easily available cyclicamines with 2-aminoarylmethanols to ring-fused quinazolinones, the core structures of numerous valuable products. The developed catalytic transformation proceeds with the merits of broad substrate scope
通过采用MOF模板方法,我们开发了一种高度分散和超低负载的钴纳米催化剂,已将其用于2-氨基芳基甲醇将易得的环胺氧化功能化为环稠合的喹唑啉酮,这是许多有价值产品的核心结构。发达的催化转化过程具有广泛的底物范围,良好的官能团耐受性和化学选择性,较高的步长和原子效率以及使用天然丰富的Co / O 2系统的优点,这为制备喹唑啉酮提供了一种实用的方法。具有结构多样性。提出的工作为将环胺基序直接转化为功能框架奠定了重要基础。
Nitrogen bridgehead compounds. 66. Bronchodilator nitrogen bridgehead compounds with a pyrimidinone moiety
New types of bronchodilator agents, bi- and tricyclic nitrogenbridgeheadcompounds with a pyrimidin-4(3H)-one ring, were synthesized and evaluated for bronchodilator activity against serotonin-, histamine-, and acetylcholine-induced spasms in the guinea pig Konzett-Rössler test. The structure-activity relationships are discussed. The effects of some bi- and tricyclic derivatives on the human bronchus
A catalytic synthetic method of 3,4-dihydroquinazolin-4-ones has been developed. When N-(2-nitrobenzoyl)amides were treated with carbon monoxide in the presence of a catalytic amount of selenium, reductive N-heterocyclization of N-(2-nitrobenzoyl)amide efficiently proceeded to give the corresponding 3,4-dihydroquinazolin-4-ones in moderate to good yields. (C) 2002 Elsevier Science Ltd. All rights reserved.